Trying to argue that neutrino experiments use GPS time, because they do?

I’m sure synchronising all the worlds detectors over direct fiber links would… work, but, they aren’t.

Unless you are trying to argue internal synchronisation in which case, obviously, but that has absolutely zero to do with losing NTP for a day, the topic of conversation.

The deployments are still obviously limited, but this is something you can straight up buy if you're near a NIST facility [0]. I believe the longest existing link is NJ<->Chicago, which is used for HFT between the exchanges.

[0] https://shop.nist.gov/ccrz__ProductDetails?sku=78200C